689305373 has 2 divisors, whose sum is σ = 689305374. Its totient is φ = 689305372.

The previous prime is 689305369. The next prime is 689305381. The reversal of 689305373 is 373503986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 562021849 + 127283524 = 23707^2 + 11282^2 .

It is a cyclic number.

It is not a de Polignac number, because 689305373 - 2² = 689305369 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689335373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344652686 + 344652687.

It is an arithmetic number, because the mean of its divisors is an integer number (344652687).

Almost surely, 2^689305373 is an apocalyptic number.

It is an amenable number.

689305373 is a deficient number, since it is larger than the sum of its proper divisors (1).

689305373 is an equidigital number, since it uses as much as digits as its factorization.

689305373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 689305373 is about 26254.6257448092. The cubic root of 689305373 is about 883.3589656104.

The spelling of 689305373 in words is "six hundred eighty-nine million, three hundred five thousand, three hundred seventy-three".